设角α终边上一点P的坐标是 (cosπ/5,sinπ/5)则α=

问题描述:

设角α终边上一点P的坐标是 (cosπ/5,sinπ/5)则α=
设角α终边上一点P的坐标是 (-cosπ/5,-sinπ/5)则α=
设角α终边上一点P的坐标是 (sinπ/5,-cosπ/5)则α=

设角α终边上一点P的坐标是 (cosπ/5,sinπ/5)则α=π/5